The rear end of my motorcycle is given me some trouble lately. When the rear wheel of the bike goes over a bump, it feels as if there are no shocks. I replaced my rear mono shocks three weeks ago with a spare one but that seems to make no difference at all. What else can be a cause??

what happens? If you can't budge it there's a problem, maybe set too stiff, is it adjustable? If so get the manual out and put all settings to stock. Or maybe there's something stuck jamming the swing arm... maybe the pivot is set wrong... Maybe yr replacement shock is a s fucked as the original....

If you can't figure it out mate i'd take it to someone who can before riding too much further

Honestly Kerry sounds to me like the whole thing's wanked.. I'd get a manual.. get the spanners out and spend the day pulling the front and rear shocks, wheels, brakes, forks, swing arm and final-drive apart.. check it's all there, lube it all up and rebuild!